查询词典 dirichlet conditions

First,we impose Dirichlet boundary conditions in stead of the semi-infinite domain in one space dimension.

首先，我们用有限区间来代替一维空间中的半无限区域。

Heat equations with Dirichlet and Neumann boundary conditions are discussed, separately.

一般线性抛物系统控制加界的约束后很显然是不能控的。

In this paper, a least-square collocation formulation for solving Helmholtz equation with Dirichlet and Neumann boundary conditions was established.

对于Helmholtz方程问题，其微分方程和边界条件可表示为法应用于Helmholtz方程问题的研究，建立了 Helmholtz方程问题的最小二乘配点格式，分别研究了Hdmholtz方程的波传播问题和边界层问题。

This paper,in which the blow-up rate of the blowup solutions is evaluated with appropriate hypotheses,considers the blow-up rate of a degenerate reaction-diffusion system with homogeneous Dirichlet boundary conditions.

文中考虑了一类退化反应扩散系统在齐次D irichlet边界条件下的爆破速率。在适当的假设条件下，得到了爆破解的爆破速率估计

In chapter 4 and chapter 5, the Dirichlet transmission conditions for overlapping Schwarz methods will be replaced by Robin transmission conditions when applied to general linear elliptic partial differential equations.

为了能够直接应用于某些实际问题，本文第六章把最优Robin参数的确定方法推广到由椭圆型问题离散化得到的稀疏矩阵问题。

With Lagrange multiplier ,Dirichlet boundary conditions are imposed along the essential boundaries.

在有限元三维20结点单元构成的空间网格上构建流形覆盖和权函数，采用拉格朗日乘子法施加位移约束条件，推导了分析静态问题的计算列式。

The purpose of this paper is to introduce an effective couple-stress continuum model to describe the performance of grid material when L \approx l_{m} and to recommend a method to calculate the effective moduli of the model. The representative volume element method Dirichlet boundary conditions is proposed.

在此基础上导出了正交各向异性偶应力介质的特征长度表达式和偶应力介质梁的抗弯刚度表达式，定义了偶应力影响因子\delta 以表征梁的偶应力效应。

Compared with the same wave problems with conventional Dirichlet boundary conditions, the absorbing boundary conditions can reduce the numerical reflection on boundaries and avoid solution distortion. In addition, the central differences method is economic in memory requirement and computing time compared with implicit integral method.

结果表明：该解法在空间上具有谱精度，在时间上达到二阶精度；与第一类边界条件相比，吸收边界有效地削弱了边界上的数值反射，避免了解的失真；使用中心差分的时间积分方法同隐式积分方法相比，适合波的传播特性，避免了矩阵求逆运算，并且占用的计算机内存小。

During the calculation the results got by quintic spline kernel was the best so it was chosen as the proper kernel for the SPH simulation. By comparison of the simulation results got by SPH and finite volume method, it was proved that the buffer cells method proposed in the SPH simulation to implement the Dirichlet boundary conditions was accurate, and this is of great importance for the simulation of flows pass a pipe. At last, the SPH method was improved to simulate the liquid-solid two phase flows and the results show that this method was appropriate for the simulation of flows containing viscous fluid and macroscopic solid components. Now the two methods are both able to predict the continuum flows and rarefied flows severally, but the hybrid program still has some aspects to be improved.

首先用标准算例验证了SPH方法的理论模型和计算程序的准确性；通过比较确定选用五次样条核作为计算低雷诺数下的粘性连续流动时的核函数；采用SPH方法和有限体积法分别对同一管道流动进行了对比计算，证明了本文提出的边界缓冲区方法在实现SPH方法中的流体边界条件时的有效性，解决了SPH方法模拟管道流动时的一个关键问题；巧妙地使用SPH方法对化工分离流动中常见的固液两相流及固液耦合作用进行了模拟尝试，获得了较好的结果；在跨尺度计算方面，目前两个子程序已经能够分别模拟连续的和稀薄的二维管流问题，二者的耦合计算程序还处于调试和优化阶段，各个参数对于计算精度和计算速度的影响规律仍在探索中。

For fourth order p-biharmonic elliptic equation with Dirichiet boundary conditions, a new Pohozaev type identity is established.

对于具有Dirichlet边界条件的四阶p-双调和椭圆方程，建立了一个新的Pohozaev恒等式。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。